Which Zelda do you mean? Real Zelda like A Link to the Past/Ocarina of Time, or Breath of the Wild/Tears of the Kingdom?
For BotW/TotK, pretty much any open world ARPG will do.
For real Zelda, I would absolutely recommend Tunic. Link’s Awakening remake was quite good, performance issues not withstanding, and Echoes of Wisdom was a fun spinoff in the same vein.
Yes. BotW and TotK departed very dramatically from what consumers would expect from Zelda. TotK was a bit closer but still was not the same. I suppose another way to say it is “true Zelda” or “pure Zelda,” but it is all the same meaning.
BotW, and to a lesser degree TotK, is to Zelda what Star Fox Adventures is to Star Fox. Not necessarily a bad game, but when someone talks about Star Fox, or “real Star Fox” they are not referring to Star Fox Adventures because it deviated so drastically from the expected gameplay of a Star Fox game.